diff --git a/readme.md b/readme.md
index eb12a94..e6df75f 100644
--- a/readme.md
+++ b/readme.md
@@ -23,7 +23,7 @@ Via `docker run`:
 ```bash
 $ docker run --rm -it \
     -p 5000:5000 \
-    -e SPACE=16G \
+    -e DISK_SIZE=16G \
     --cap-add NET_ADMIN \
     --cap-add SYS_ADMIN \
     --device=/dev/kvm:/dev/kvm \
@@ -49,7 +49,7 @@ services:
         ports:
             - 5000:5000
         environment:
-            SPACE: 16G
+            DISK_SIZE: 16G
         restart: always
 ```